Abstract: An oil repelling agent to coat a dynamic pressure device, such as a fluid dynamic pressure bearing device, includes a UV coloring agent, a fluorine-based polymer and a solvent. In an exemplary embodiment of the invention, the density of the UV coloring agent component is about 100 PPM to about 400 PPM, and the density of the fluorine polymer is about 0.1% by weight to about 0.6% by weight.

Abstract: In exposing a photocurable resin to light, the light is irradiated on the photocurable resin while a base material to which the photocurable resin is applied is immersed in a liquid. An apparatus for carrying out the exposure includes an exposure tank in which a liquid does not dissolve the photocurable resin is reserved and a light source irradiating light to the photocurable resin is immersed in the liquid reserved in the tank. The exposure tank has two opposite side walls which have exposure windows closed by transparent plates respectively. The apparatus may include a plurality of light sources disposed so as to correspond to the representative exposing window. A temperature of the liquid in which the base material is immersed is controlled.

Abstract: A method of forming solder bumps on pads formed on a surface of a base material includes the steps of supplying solder to a template having a number of through holes formed to correspond to the pads of the base material respectively so that the through holes are filled with the solder, the template having an upper side and an underside, scraping the sides of the template with doctors to remove an excessive amount of solder, and opposing the template to the base material so that the pads are aligned with the through holes respectively, covering the side of the template opposite to the base material with a pressure housing and increasing pressure in an interior of the pressure housing so that a difference in pressure between an exterior and the interior of the pressure housing extrudes the molten solder from the template to the pad side of the base material.

Abstract: In exposing a photo-curing type resin to light, the light is irradiated to the photo-curing type resin while a base material to which the photo-curing type resin is applied is impregnated in a liquid. An apparatus for carrying out the exposure includes an exposure tank in which a liquid which does not dissolve the photo-curing type resin is reserved and a light source irradiating light to the photo-curing type resin impregnated in the liquid reserved in the tank. The exposure tank has two opposite side walls which have exposure windows closed by transparent plates respectively. The apparatus may include a plurality of light sources disposed so as to correspond to the respective exposing windows. A temperature of the liquid in which the base material is impregnated is controlled.